Furnace



2 Sheets-Sheet l.l J. EVANS.

PURNAE.

(No Model.)

2 Sheets-Sheet 2.

J. EVANS.

' PURNAGB.

(No Model.)

Patented July 19, 1887.

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UNITED STATES PATENT EEICE@ JOHN EVANS, OF PHILADELPHIA, PENNSYLVANIA.

FU RNACE.

SPECIFICATION forming part of Letters Patent No. 366,657, dated July 19, 1887.

Serial No. 104,062.

(No model.)

ff (/,ZZ whom, 'it may concern:

Be it known that l, JOHN EVANS, a citizen ol' the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Furnaces,` of which the following is a specification.

The invention consists iu the combination and arrangement within an inclosing-casing divided by a horizontal iloor into hot and cold air chambers, and provided with openings for the admission of air to support combustion, with smoke-drums forming radiators, a coldair inlet in the base, within which is the de pressed smokeeexit of large and small pipes, as will be more fully understood from the following description and drawings attached thereto.

I In the accompanying drawings, which make a part of this specification, Figure l is a plan view of my improved furnace with the top of the inclosingwalls forming the hoteair chamber removed. Fig. 2 is an elevation in section with the rear wall of the furnace re-v moved. Fig. 3 is a section taken through the line x .r ofFig. 2 in the direction of the arrow R. Fig. ll is a face view of a portion of the upper plate of the air-conductorn Like letters of reference in all the figures indicate similar parts.

A indicates theinclosing-walls of the furnace, divided into hot and cold air chambers by a horizontal floor, having openings to permit of the entrance of air to support combustion, and in which the heater is mounted, with its series of smoke-drums leading to the exitpipe, 'forming radiators; B, the central heat-radiating drum, within which in the base is situated the fire-pot and its iredoor I) These parts are common in the construction of all` furnaces.

C C C'l are upright cylindrical metallic drums, their lower ends resting upon circular or ring-shaped tripods d on the surface of the upper plate of the airA conductor E. The drum C is connected near its upper end to the central radiating-drum, B, by means of the short pipe c. The smoke and gas evolved during the process of combustion of the fuel within the fire-pot are caused by the draft carried through the lire, havin entrance from the ash-pit opening, from thence through the grate in the customary manner and caused to enter this drum, pass down through it and through the pipe c/ into the drum C, whence they are carried upward and into the drum C2 through the pipe c2, from whencethe draft causes them to be carried down, and by means of the connectingpipec3 into and through the horizontal drum C, from thence into the exitpipe c and into and out of the chimney-flue connected thereto at the outer or extreme end.

E is the airlconductor, constructed of suitable nouheat-conducting material, surround ing the exit-pipe c4 and horizontal drum C, leaving sufficient space between the drum, exit-pipe, and inner surfaces of its walls for the passage of a current of cold air. This conductor may have its mouth or inlet-opening located at any convenient point upon the exterior wall of a building to permit the entrance therein of air. It is provided with orifices h in its upper removable lid or plate immediately beneath each vertical drum. There are also outlet-channels k in the base of the inner side walls, through which the main portion of the current of cold air is caused to pass and come into contact with the exterior surface of the lire-pot, thereby absorbing the intense heat therefrom.

The operation of my improved furnace is as follows: Fire having been kindled in the lirepot H, (seen in Fig. 3,) which is situated in the base of the central heat-radiating drum, B, the smoke and gas evolved from and during the process of combustion ,of fuel pass from said druln into the pipe c, connected to the vertical drum C, and thence through the connected series of drums C (1 C into and through the horizontal drum C, from thence into, through, and out of the eXit-pipe e, connected to said drum, and into a chimney-flue. By reason of the generated heat in the fire-pot radiating through and out of the central drum, B, a current of heated air is caused to ascend within the surrounding chamber of the furnace to the hotair-exit ilucs J, consequently drawing air inward from the mouth or inletopening of the conductor E, (the course of the current of cold air being indicated by d-arts,) which passes in a contrary direction to the current of smoke and gas in the exit-flue e* and horizontal drum (the course of this v current being indicated by feathered darts,)

major portion of said current passes through the channels 7c, striking against the Wall of the fire-pot, becoming highly heated previous to its exit from the upper part of the furnace through the'lues J, and as cold air necessary to create a current into the furnace, from thence into the upper apartments of a building, to be effective in its result can only be brought into a furnace at its base, the smoke and gas must be brought down in order that the heat contained therein may be extracted.

I am aware that a .series of connected up :right drums connected to a central radiating drum, to provide a large amount of surface to the action of a current of air,havebeen constructed in a furnace; also, that the exit smoke-pipe has been surrounded by a flue carrying air; but

What I do claim as my invention, and desire to secure by Letters Patent, is-

The combination of the 'inclosingcasing A, divided into a hot-air and a cold-air chamber by a horizontal floor having openings therein to admit air to support combustion, theheater r mounted therein, the smoke-drums forming a radiator in the hot-air chamber, the cold-air inlet E in the base o f the apparatus, and the depressed smoke-exit composedv of large pipe C3 and the smaller pipe, et, located in the airinlet, substantially in the manner herein shown and described.

JOHN EVANS.

,Witncsses:

THOMAS J. BEWLEY, J. R.' MAssEY. 

